RE: [Xen-users] drbd8 - lvm - xen

[Sebastian Igerl <sig@xxxxxxxxx>]

On Thu, 2008-09-11 at 09:42 +0100, Robert Dunkley wrote:
> The DRBD device is in use by Dom0 or another DomU. Try one DRBD device
> per VM, if you have already done this then make sure the DRBD device is
> NOT mounted in Dom0.
> 
> Rob
> 
> -----Original Message-----
> From: Sebastian Igerl [mailto:sig@xxxxxxxxx] 
> Sent: 11 September 2008 09:36
> To: Robert Dunkley
> Cc: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] drbd8 - lvm - xen
> 
> Hi,
> 
> Found out that it didn't had anything to to with drbd or lvm... 
> 
> I upgraded from 3.2.1  to xen-3.3.0...
> 
> No i can't start any domu's... regardless if they are on lvm drbd oder
> local partiton...
> 
> Does anyone has any idea ?
> 
> xen4 conf # xm create test1.cfg 
> > Using config file "./test1.cfg".
> > Error: Device 768 (vbd) could not be connected.
> > Device /dev/xen3and4/hd23 is mounted in the privileged domain,
> 
> 
> 
> xen4 conf # xm create test1.cfg 
> > Using config file "./test1.cfg".
> > Error: Device 768 (vbd) could not be connected.
> > Device /dev/sda5 is mounted in the privileged domain,
> 
> 
> 
> 
> another thing is... : is ist possible to make 20 different drbd devices
> on one host ? drbd0 - drbd20 ? aren't there limits ? 
> 
> 
> On Wed, 2008-09-10 at 15:27 +0100, Robert Dunkley wrote:
> > Hi Sebastian,
> > 
> > I think you should split the volume into LVM partitions and then run a
> > DRBD device for each partition. I run this config, RaidArray -> LVM ->
> > DRBD8 -> Xen and it works well. You need the independence of one drbd
> > device per VM otherwise things are difficult. You may also want to ask
> > xen-users -at- antibozo.net for their DRBD script, on my Centos Xen
> 3.30
> > setup it works much better, it also avoids the need for IMHO dangerous
> > dual primary config.
> > 
> > I synch multiple arrays with multiple DRBD devices at once. DRBD
> equally
> > shares the array write bandwidth between DRBD devices. My Raid1 arrays
> > manage 80Mb/second each write speed, 2 DRBD devices synching at once
> on
> > each of the 3 arrays yields 40mb.sec per DRBD device which totals a
> > perfect 240Mb/sec synch rate (I used Infiniband to link the two DRBD
> > servers together so am not bound by the bandwidth constraints of GB
> > Ethernet). 
> > 
> > Rob
> > 
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Sebastian
> > Igerl
> > Sent: 10 September 2008 14:54
> > To: xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] drbd8 - lvm - xen
> > 
> > Hi,
> > 
> > What I'm trying to to is to set up 1 drbd active/active device then
> > split this with lvm creating about 20 volumes and then run xen on top
> of
> > that lvm volums !
> > 
> > I tried for days now and it isn't working... anyhow, do you see any
> > problems why this shouldn't work..
> > 
> > Should I create 20 drbd devices and use the drbd helper script for xen
> ?
> > isn't using so many drbd syncs a lot of overhead ? never tried it...
> > 
> > 
> > xen4 conf # xm create test1.cfg 
> > Using config file "./test1.cfg".
> > Error: Device 768 (vbd) could not be connected.
> > Device /dev/xen3and4/hd23 is mounted in the privileged domain,
> > 
> > 
> > This is what i'm getting right now.. 
> > /dev/xen3and4/hd23 isn't mounted...
> > 
> > 
> > 
> > xen4 conf # cat test1.cfg 
> > 
> > kernel = "/usr/lib64/xen/boot/hvmloader"
> > builder = "hvm"
> > device_model = "/usr/lib64/xen/bin/qemu-dm"
> > memory = "1024"
> > maxmem = 2048
> > maxmemory = 2048
> > name = "test1"
> > 
> > dhcp = "off"
> > vif = ["type=ioemu, mac=00:16:3e:00:00:20, bridge=xenbr0"]
> > #cpus = ""
> > #vcpus = 1 
> > disk = ["phy:/dev/xen3and4/hd23,ioemu:hda,w" ]
> > 
> > serial="pty"
> > boot="c"
> > 
> > vnc=1
> > vncviewer=0
> > keymap="de"
> > vfb = [ "type=vnc, vncpasswd=ssss, vnclisten=0.0.0.0, vncdisplay=23" ]
> > sdl=0
> > 
> > 
> > 
> > since i'm using lvm on top of drbd, xen should'nt be aware of drbd..
> > using only lvm it workd...
> > 
> > mouting   drbd-lvm2-device works too.... ( only on one site because i
> > haven't set up any cluster filesystems.. )
> > 
> > 
> > 
> > Thanks,
> > 
> > Sebastian
> > 
> > 
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